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On 08/02/2012 21:25, Christopher Schultz wrote:
> Mark,
> 
> On 2/8/12 3:37 PM, Mark Thomas wrote:
>> On 08/02/2012 20:35, Christopher Schultz wrote:
>>> Can anyone think of a reason I can't just [chop-off everything
>>>  after the first ";"]?
> 
>> Yes. Path parameters can occur at any part of the path.
> 
> So a URI could look like this:
> 
> /context/something;p1=val;p2=val/morestuff

Yes.

> ... and that URI would match /context/something/morestuff as a 
> uri-pattern for, say, filter or servlet mappings?

Yes, as per section 12.1 of the 3.0 servlet spec (and equivalent in
earlier versions).

> Does Tomcat attempt to ignore path parameters when going these
> types of matches? (I'd read the code, but the mapper is, as you
> know... complex).

The real trick is knowing that you don't need to look at the mapper
code :). Of course, it helps if you remember that you wrote the code
in question ;) Take a look at CoyoteAdapter#parsePathParameters()

> Path segments are separated by / characters, so perhaps I could
> adjust my "ignore the path parameters" algorithm to work like
> this:
> 
> Starting from the end of the URI, rewind until I hit a "/", then
> go forward until I hit a ";", then trim forward from the ";".

They can also be on the final path segment (and usually are).

> Or, I could just say "ignore anything like 
> ';jsessionid=[0-9A-Za-z]*'", but that's a little presumptuous and 
> potentially fragile as well.

Indeed.

Unfortunately, the servlet spec is far from clear on how path
parameters should be handled. I hope to get clarity in 3.1 with [1]

Mark

[1] http://java.net/jira/browse/SERVLET_SPEC-18

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